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- Title
ANALYSIS OF COLLISION BETWEEN DRILLSTRING AND WELL SIDEWALL.
- Authors
ZHAO, G.H.; LIANG, Z.
- Abstract
Drillstring is the most important tool in petroleum drilling engineering. Alternating stress has been found to be responsible for the premature failure of drillstring. Propagation of stress wave, induced by collision between tool-joints of drillstring and borehole wall, is studied in this paper. The condition that all the tool-joints of drill pipes (DPs) strike borehole wall at the same time has been considered. Because of symmetry, the middle cross section of the DP is simplified as fixed end, and mechanical model is established as the beam with both ends fixed. Propagation of lateral displacement wave and stress wave in the DP is investigated by means of Eigen-frequency method and the Finite Element Analysis software ANSYS. The theoretic results coincide with those obtained from numerical modeling very well and also explain the drillstring accidents in gas fields.
- Subjects
PETROLEUM prospecting; DRILLING &; boring machinery; DRILL pipe; STRAINS &; stresses (Mechanics); STRENGTH of materials
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2008, Vol 22, Issue 31/32, p5459
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979208050656